Malicious PDF — malware analysis report

Static analysis result for SHA-256 a843391a1bb51e9e…

MALICIOUS

PDF

40.1 KB Created: 2020-08-21 23:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd82309df57ed9e05145a207f64904fc SHA-1: 3c4d8a0b1f8f6ec19781732479bd19c9db9a3637 SHA-256: a843391a1bb51e9e2d33ea49a62b98dc8b1126c17e5cf29c5460393be0d96bf7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a 'guideposts coupon code'. The document also features a large number of embedded links to various PDF files, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=guideposts+coupon+code
    • http://files.julianhistoricalsociety.org/uploads/1/3/0/9/130969220/287965934c.pdf
    • http://relat.nashuaover70softball.org/uploads/1/3/1/3/131379894/28a1466c8301a2b.pdf
    • http://ralimulub.finditfilms.com/uploads/1/3/1/6/131636947/24564.pdf
    • http://vaxeli.honesthomeinspector.com/uploads/1/3/1/0/131070197/8dcb1.pdf
    • http://files.anjaliyogact.com/uploads/1/3/1/4/131408170/7936527.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/burger_king_gutscheine_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/74347577112.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/ritabomazutidejano.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/vixekogaxubuluvivijuluki.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/luzajavevimutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/aadhar_card_password_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/cgsb_48._9712.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601d.bin
6001871d87f74b670e358e165c90461d22039d84cff5418848cd4003434596e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 4760 bytes
font_01_sfnt_off00007069.bin
467fa6235bda9fe630b93e0bca4f8a17b38afd8cd63475c6fdd12a9e23c8238d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 10420 bytes